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11. Consider an open PVC pipe that is 5 m long and has a fundamental frequency of 70 Hz, open at both ends. a) If the pipe is cut in half, what is the new fundamental fre- quency? (include units) b) If after being cut in half in a), the pipe is closed off at one end, what is the new fundamental frequency? (include units) c) The speed of sound in helium is approximately 3 times faster than in air. If the pipe in part b) is filled with helium, what is the new fundamental frequency? (include units)

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